Summit SMB119可编七路电源方案

       Summit公司的SMB119是七路可编程DC/DC电源管理器,它内置的数字可编程性使得设计者可设计出定制化产品.

       SMB119集成了三个同步的降压稳压器,一个可编程的升压转换器或降压同步转换器,两个升压转换器和一个线性低压降(LDO)稳压器.SMB119的输出精度可达1.5%.,广泛应用手提媒体播放器(PMP),数码摄像机/数码相机,智能PDA/照相手机,手持GPS/PDA以及其它手提设备.本文介绍了SMB119的主要性能, 7路应用方框图以及可编程功率管理器的应用电路图.

       Seven-Channel Programmable DC-DC Power Manager SMB119
The SMB119 is a highly integrated and flexible seven-channel power manager designed for use in a wide range of portable applications. The built-in digital programmability allows system designers to custom tailor the device to suit almost any multi-channel power supply application from digital camcorders to mobile phones.

       The SMB119 integrates all the essential blocks required to implement a complete seven-channel power subsystem including three synchronous step-down “buck” converters, one configurable step-up “boost” or step-down synchronous “buck” converter, two step-up (boost) converters, and one linear regulator (LDO).

       Additionally sophisticated power control/monitoring functions required by complex systems are built-in. These include digitally programmable output voltage setpoint, power-up/down sequencing, enable/disable, margining, dynamic voltage management, and UV/OV input/output monitoring on all channels. By incorporating a second ENABLE input and 7-level dynamic voltage control, the SMB119 is ideal for powering systems based on Xscale™ and other similar processors.

       The integration of features and built-in flexibility of the SMB119 allows the system designer to create a “platform solution” that can be easily modified via software without major hardware changes. Combined with the re-programmability of the SMB119, this facilitates rapid design cycles and proliferation from a base design to futures generations of product.

       The SMB119 is suited to battery-powered applications with an input range of +2.7V to +6.0V and provides a very accurate voltage regulation (<1.5%). Communication is accomplished via the industry standard I2C bus. All user-programmed settings are stored in nonvolatile EEPROM of which 96 bytes may be used for general-purpose memory applications. The commercial operating temperature range is 0C to +70C, the industrial operating range is –40C to +85C, and the available package is a 48-pad 7mm x 7mm QFN.

       主要特性:
       Digital programming of all major parameters via I2C interface and non-volatile memory
       Output voltage setpoint/margining
       Sequencing & digital soft start
       Enable/Disable outputs independently
       Input/Output UV/OV voltage thresholds
       PWM/PFM mode
       Seven programmable regulator channels with 1.5% accuracy
       Three synchronous step-down (buck) with internal PFETs
       Two step-up (boost)
       One configurable step-up (boost) or step-down (buck)
       One adjustable output voltage LDO
       +2.7V to +6.0V Input Range (Higher system voltages supported)
       Built-in current limiting, UV/OV, and thermal protection
       Highly accurate reference and output voltage (<1.5%)
       1MHz PWM frequency and automatic power-saving PFM mode
       96 bytes of user configurable nonvolatile memory
       Space-saving 7x7 QFN-48 package

       主要应用:
       Portable Media Players
       Digital camcorders/still cameras
       Smart PDA/Camera phones
       Handheld GPS/PDAs
       Portable Equipment

图1. SMB119 7路应用方框图

图2. SMB119典型应用电路图(QFN-48封装)




                                 图3. SMB119可编程功率管理器应用电路图
    

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本文来源：Summit公司    作者：

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